RTX testing

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RTX testing

Postby imagee » Tue Feb 11, 2020 5:48 pm

imagee Tue Feb 11, 2020 5:48 pm
I'm struggling to see any RTX improvements in my test renders. I made a basic sphere with x1000 tubes scattered on it, and with RTX enabled the render was taking 1s longer.

rtx_test.zip
(1.92 MiB) Downloaded 32 times


I also exported the same object to the standalone and there there was a x1.45 speed increase. also brought the same obj into C4D and it showed the same speed increase with RTX.

I'm starting to think I don't have RTX enabled correctly in Houdini? I have motion blur disabled, I'm not sure what else to try.

Has anyone had this problem? Also had the same issues with XB1 XB2 and XB3

rtx.PNG

nortx.PNG
imagee
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Re: RTX testing

Postby juanjgon » Tue Feb 11, 2020 6:52 pm

juanjgon Tue Feb 11, 2020 6:52 pm
Hmm, perhaps somehow you are not building exactly the same scene in C4D or in Standalone. I've exported your scene to the Standalone and I get the same behavior, near the same render time with/without RTX, probably because this scene is too simple to improve its render time using RTX... in fact, I've found that the RTX rendering can be even a lot slower if you use the DirectLighting kernel. Be aware that you are not creating instances using this workflow.

Check the attached scene. It has 1000 instances of your object. The render time is twice faster with the RTX option enabled.

Thanks,
-Juanjo
Attachments
rtxtest.zip
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Re: RTX testing

Postby imagee » Tue Feb 11, 2020 10:29 pm

imagee Tue Feb 11, 2020 10:29 pm
Hey juanjgon, thanks for the quick reply as always!

I opened up your Houdini scene with the 1000 extra instances, and I rendered it in 1 minute 11 seconds, and then I turned on RTX and it rendered in 1 minute and 12 seconds. So I think I am still missing something here. Maybe I'm not enabling RTX correctly?
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Re: RTX testing

Postby juanjgon » Tue Feb 11, 2020 11:33 pm

juanjgon Tue Feb 11, 2020 11:33 pm
Have you closed and reopened the IPR window after enabling/disabling the RTX option? A change in this feature needs a Octane restart, something that happens only when you open the IPR window or when you render to disk.

Thanks,
-Juanjo
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Re: RTX testing

Postby snakeboxmedia » Tue Feb 11, 2020 11:34 pm

snakeboxmedia Tue Feb 11, 2020 11:34 pm
imagee wrote:Hey juanjgon, thanks for the quick reply as always!

I opened up your Houdini scene with the 1000 extra instances, and I rendered it in 1 minute 11 seconds, and then I turned on RTX and it rendered in 1 minute and 12 seconds. So I think I am still missing something here. Maybe I'm not enabling RTX correctly?


Make 100% sure you have motion blur DISABLED in the render options, and I mean everything unticked, otherwise RTX simply won't kick in.
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Re: RTX testing

Postby imagee » Wed Feb 12, 2020 4:49 am

imagee Wed Feb 12, 2020 4:49 am
Ok thanks for the help. i'm seeing the %50 speed increase now. I made sure the motion blur was disabled and completely reopened the octane live viewer, and things started working nicely. Also I noticed that in C4D there was a line in the render statistics that says if RTX is on or off, it might be nice to have that feature in the Houdini too eventually. Thanks again!
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